That document represents intent to implement, but SAM handling isn't
implemented yet in GWT 2.7, since it is most useful after Java8 lands.
Shortly Java8 will land, and then SAM handling in JsInterop and you'll
be able to use GWT 2.8 nightly snapshots. For now, you'll need a
utility function that wraps a SAM as a function, e.g.
public static native JavaScriptObject samToFunction(MyCallback cb) /*-{
return function(arg) { return cb.@MyCallback::someMethod(*)(arg); };
}-*/;
On Tue, Nov 4, 2014 at 11:28 PM, Kay-Uwe Janssen <kujans...@gmail.com> wrote:
> As i had no luck on Google+ yet, i'll try it here.
>
> First the G+ Post:
> https://plus.google.com/116136390679208063122/posts/52kcbwwngWo
>
>
> Well I just started to work on a ChromeCast Receiver built with GWT. As the
> Receiver API is in JS i wanted to try JSInterop over JSNI but had some
> struggle.
>
> The ChromeCast Api has some properties that can be set with a function to
> act as a callback. eg for onReady.
>
> castReceiverManager.onReady = function(event) {
> // do stuff
> };
>
> Now my question is: How can i do this with JsInterop or is it not yet
> possible?
>
> as mentioned in
> https://docs.google.com/document/d/1tir74SB-ZWrs-gQ8w-lOEV3oMY6u6lF2MmNivDEihZ4
> below "Single Abstract Method Handling" i tried something like this
>
> @JsType
> public interface Receiver {
> @JsProperty
> void onReady(Runnable onReady);
> }
>
> when trying to execute the method with this snipped i get "Exception caught:
> (TypeError) : object is not a function"
>
> private native void test(Receiver receiver)/*-{
> receiver.onReady();
> }-*/;
>
>
> to see whats the value of onReady i did console.log(receiver) and got this:
> (where onReady is set the way above and onSenderConnected has been set the
> JS way inside an JSNI method.
>
> onReady: JsTest$1_1_g$
> onSenderConnected: function (event_0_g$)
>
>
> is there a way to achieve this yet or do i have to wait for 2.8/3.0?
>
> i tried to dig into the gwt code to see if there is a way to add something
> to support this but unfortunately the gwt code for js processing is a bit
> out of my scope.
>
>
> some possible solutions would be either
> interface JsFunction {
> <T> T call(Object... args);
> }
> or
> interface MyOnReadyCallback {
> @JsFunction
> MyReturnType anyName(String arg1, boolean arg2, SomeOtherType arg3);
> }
>
> and let the "Single Abstract Method Handling" find the method and add it.
>
>
> Thanks! :)
>
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